BTQ Glossary – AV Equipment - srihm

BTQ Glossary – AV Equipment

BTQ GLOSSARY – AV EQUIPMENT

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DAIS

A raised (elevated) platform often for dignified and/or distinguished occupancy. Lecterns (for speakers), head tables for formal occasions or chairs with/without a coffee table (for functions like weddings and panel discussions) are common fixtures on a dais..

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A dais may be located either inside or outside a room or enclosure and is always positioned upfront at a venue and persons on it face to the audience/attendees.

A Head Table on a Dias

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A Head Table on a Dias

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A Bridal Dias

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A dais may be a raised permanent part of the room, or in the form of a raised wooden platform or made by assembling riser sections.

EASEL

An easel is a portable upright support used for displaying and/or fixing something resting upon it, such as flip charts, signs, boards (white, magnetic, cork), posters, etc. usually at a slight angle (of about 20° to the vertical). The height at which the object is rested on an easel is usually adjustable.

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FLIP CHARTS

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LECTERN

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PODIUM

There are two meanings of the term podium given below: (i) A raised platform or stage upon which a speaker stands. Small podiums are used by conductors of orchestras or by winners of sports events to receive their awards. Podiums raise something or someone a short distance above its surroundings.

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The second meaning is proscribed by many who feel that the because of its Greek etymology (pothi meaning foot), the word podium ought to refer to something that is stood upon and that lectern should instead be used, as it refers to reading.

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LAVALIER MICROPHONE

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A small discrete wired or wireless microphone that is used for television, theatre, and public speaking applications in order to allow for hands-free operation by being attached to around the neck, to collars , ties, or other clothing usually with a clip. Also called a lapel, neck, or pendant microphone.

The term lavalier originally referred to jewellery in the form of a pendant worn around the neck.Its use as the name of a type of microphone originates from the 1930s,when various practical solutions to microphone use involved hanging the microphone from the neck.The pattern of picking up sounds could be

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Omnidirectional

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Cardioid

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KEYSTONING

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Distortion of a projected image resulting from the axis of projection NOT being perpendicular to the screen is known as a keystone error. The resulting projected image is skewed, trapezoidal in shape and text may be fuzzy due to the distortion.

Distortion of a projected image that results from resulting from the axis of projection NOT being perpendicular to the screen is known as a keystone error. The resulting projected image is skewed, trapezoidal in shape and text may be fuzzy due to the distortion.

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Vertical Keystone Errors

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Horizontal Keystone Errors

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Rectifying a keystoned image involves aligning the angle between the projector and screen to 90 degrees. This can be achieved by
• physically moving the projector more to the center of the screen or using an inbuilt manual keystone correction facility if available or a doing a lens shift if such feature is available
• tilting the screen in a small angle
• the use of special software on the projector (automatic keystone correction)
• and computer controlling the projector.

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How the Term Derives

A keystone is the wedge-shaped stone piece at the apex of a masonry arch. It is the final piece placed during construction and locks all the stones into position, allowing the arch to bear weight.

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TELECONFERENCING

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Teleconferencing is a generic term that refers to the live exchange and mass articulation of information among people at multiple locations by electronic linkage (i.e. telecommunication channels and systems). This makes it a dynamic and interactive means of communication.

Four distinct types of teleconference (also called teleseminars) are:
(i) audio teleconference
(ii) audiographic teleconference
(iii) computer teleconference and
(iv) video teleconference.

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Internet teleconferencing (including web conferences) is an extremely popular means of teleconferencing today

MONITOR

An electronic device used to view video or as a visual display for computer output.

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OPAQUE PROJECTOR (episcope)

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An optical device that uses reflected light to project an enlarged image of an opaque object such as a photograph, a printed page or a drawing onto a screen

An opaque projector uses a bright lamp that shines onto the object from above and a system of mirrors, prisms and/or imaging lenses is used to focus an image of the opaque material onto a viewing screen.

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Because they must project the reflected light, opaque projectors require brighter bulbs and larger lenses than overhead projectors. Care must be taken that the materials are not damaged by the heat generated by the light source. Opaque projectors are not as common as the overhead projector.

ROVING MICROPHONE

Hand held microphones either wireless or wired with a with long cord that allow a speaker to move around more freely.

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Corded roving microphones are today used in smaller areas where the number of users are few and the areas is not crowded such as stage performances, interviews or compeering. Users must be familiar with the range and handling of the cord of such microphones. Of course, wired roving microphones can be replaced with wire free ones but not always vice-versa

Wireless roving microphones are a necessity at functions when a facilitator needs to roam amongst a large audience who may be (randomly) required to ask or answer questions

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TABLE MICROPHONE

Microphone attached to a small stand or holder placed on a table, desk, or lectern. Usually wired, especially when their position is permanent but wireless versions exist too. Conference microphones are slim necked in nature (often goose necked) bodied table microphones often clubbed with a speaker unit to listen when others talk.

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CONFERENCE MICROPHONE

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OVERHEAD PROJECTOR

An overhead projector is used to display the contents of a transparency by projecting the same onto a screen for the audience.

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Facilitators can write on transparencies as they are projected.

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A lecturer using an OHP

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